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+;;; dos-win32.el --- Functions shared among MS-DOS and Win32 (NT/95) platforms
+
+;; Copyright (C) 1996 Free Software Foundation, Inc.
+
+;; Maintainer: Geoff Voelker (voelker@cs.washington.edu)
+;; Keywords: internal
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; Parts of this code are duplicated functions taken from dos-fns.el
+;; and winnt.el.
+
+;;; Code:
+
+;;; Add %t: into the mode line format just after the open-paren.
+(let ((tail (member "   %[(" mode-line-format)))
+  (setcdr tail (cons (purecopy "%t:")
+		     (cdr tail))))
+
+;; Use ";" instead of ":" as a path separator (from files.el).
+(setq path-separator ";")
+
+;; Set the null device (for compile.el).
+(setq grep-null-device "NUL")
+
+;; Set the grep regexp to match entries with drive letters.
+(setq grep-regexp-alist
+  '(("^\\(\\([a-zA-Z]:\\)?[^:( \t\n]+\\)[:( \t]+\\([0-9]+\\)[:) \t]" 1 3)))
+
+;; For distinguishing file types based upon suffixes.
+(defvar file-name-buffer-file-type-alist
+  '(
+    ("[:/].*config.sys$" . nil)		; config.sys text
+    ("\\.elc$" . t)			; emacs stuff
+    ("\\.\\(obj\\|exe\\|com\\|lib\\|sys\\|chk\\|out\\|bin\\|ico\\|pif\\)$" . t)
+					; MS-Dos stuff
+    ("\\.\\(arc\\|zip\\|pak\\|lzh\\|zoo\\)$" . t)
+					; Packers
+    ("\\.\\(a\\|o\\|tar\\|z\\|gz\\|taz\\)$" . t)
+					; Unix stuff
+    ("\\.tp[ulpw]$" . t)
+					; Borland Pascal stuff
+    ("[:/]tags$" . t)
+					; Emacs TAGS file
+    )
+  "*Alist for distinguishing text files from binary files.
+Each element has the form (REGEXP . TYPE), where REGEXP is matched
+against the file name, and TYPE is nil for text, t for binary.")
+
+(defun find-buffer-file-type (filename)
+  ;; First check if file is on an untranslated filesystem, then on the alist.
+  (if (untranslated-file-p filename)
+      t ; for binary
+    (let ((alist file-name-buffer-file-type-alist)
+	  (found nil)
+	  (code nil))
+      (let ((case-fold-search t))
+	(setq filename (file-name-sans-versions filename))
+	(while (and (not found) alist)
+	  (if (string-match (car (car alist)) filename)
+	      (setq code (cdr (car alist))
+		    found t))
+	  (setq alist (cdr alist))))
+      (if found
+	  (cond ((memq code '(nil t)) code)
+		((and (symbolp code) (fboundp code))
+		 (funcall code filename)))
+	default-buffer-file-type))))
+
+(defun find-file-binary (filename)
+  "Visit file FILENAME and treat it as binary."
+  (interactive "FFind file binary: ")
+  (let ((file-name-buffer-file-type-alist '(("" . t))))
+    (find-file filename)))
+
+(defun find-file-text (filename)
+  "Visit file FILENAME and treat it as a text file."
+  (interactive "FFind file text: ")
+  (let ((file-name-buffer-file-type-alist '(("" . nil))))
+    (find-file filename)))
+
+(defun find-file-not-found-set-buffer-file-type ()
+  (save-excursion
+    (set-buffer (current-buffer))
+    (setq buffer-file-type (find-buffer-file-type (buffer-file-name))))
+  nil)
+
+;;; To set the default file type on new files.
+(add-hook 'find-file-not-found-hooks 'find-file-not-found-set-buffer-file-type)
+
+
+;;; To accomodate filesystems that do not require CR/LF translation.
+(defvar untranslated-filesystem-list nil
+  "List of filesystems that require no CR/LF translation during file I/O.
+Each element in the list is a string naming the directory prefix
+corresponding to the filesystem.")
+
+(defun untranslated-canonical-name (filename)
+  "Return FILENAME in a canonicalized form.
+This is for use with the functions dealing with untranslated filesystems."
+  (if (memq system-type '(ms-dos windows-nt))
+      ;; The canonical form for DOS/NT/Win95 is with A-Z downcased and all
+      ;; directory separators changed to directory-sep-char.
+      (let ((name nil))
+	(setq name (mapconcat
+		    '(lambda (char)
+		       (if (and (<= ?A char) (<= char ?Z))
+			   (char-to-string (+ (- char ?A) ?a))
+			 (char-to-string char)))
+		    filename nil))
+	;; Use expand-file-name to canonicalize directory separators, except
+	;; with bare drive letters (which would have the cwd appended).
+	(if (string-match "^.:$" name)
+	    name
+	  (expand-file-name name)))
+    filename))
+
+(defun untranslated-file-p (filename)
+  "Test whether CR/LF translation should be disabled for FILENAME.
+Return t if FILENAME is on a filesystem that does not require
+CR/LF translation, and nil otherwise."
+  (let ((fs (untranslated-canonical-name filename))
+	(ufs-list untranslated-filesystem-list)
+	(found nil))
+    (while (and (not found) ufs-list)
+      (if (string-match (concat "^" (regexp-quote (car ufs-list))) fs)
+	  (setq found t)
+	(setq ufs-list (cdr ufs-list))))
+    found))
+
+(defun add-untranslated-filesystem (filesystem)
+  "Record that FILESYSTEM does not require CR/LF translation.
+FILESYSTEM is a string containing the directory prefix corresponding to
+the filesystem.  For example, for a Unix filesystem mounted on drive Z:,
+FILESYSTEM could be \"Z:\"."
+  (let ((fs (untranslated-canonical-name filesystem)))
+    (if (member fs untranslated-filesystem-list)
+	untranslated-filesystem-list
+      (setq untranslated-filesystem-list
+	    (cons fs untranslated-filesystem-list)))))
+
+(defun remove-untranslated-filesystem (filesystem)
+  "Record that FILESYSTEM requires CR/LF translation.
+FILESYSTEM is a string containing the directory prefix corresponding to
+the filesystem.  For example, for a Unix filesystem mounted on drive Z:,
+FILESYSTEM could be \"Z:\"."
+  (setq untranslated-filesystem-list
+	(delete (untranslated-canonical-name filesystem)
+		untranslated-filesystem-list)))
+
+(provide 'dos-win32)
+
+;;; dos-win32.el ends here